In the experimental condition, Pteridium aquilinum Net photosynthetic rate increase by Photosynthetic active Radiation increasing before it reachs Light saturation point, Light compensation pointis and Light saturation point are even lower, that is partly 50µmol·m−2·s−1 and 400µmol·m−2·s−1. It tells Pteridium aquilinum has character of shade plants. Some measures should be considered in the practical production.